NOT_ANALYZED_NO_NORMS

Expert: Index the field's value without an Analyzer,
and also disable the storing of norms. Note that you
can also separately enable/disable norms by calling
AbstractField.setOmitNorms(boolean). No norms means that
index-time field and document boosting and field
length normalization are disabled. The benefit is
less memory usage as norms take up one byte of RAM
per indexed field for every document in the index,
during searching. Note that once you index a given
field with norms enabled, disabling norms will
have no effect. In other words, for this to have the
above described effect on a field, all instances of
that field must be indexed with NOT_ANALYZED_NO_NORMS
from the beginning.

ANALYZED_NO_NORMS

Expert: Index the tokens produced by running the
field's value through an Analyzer, and also
separately disable the storing of norms. See
NOT_ANALYZED_NO_NORMS for what norms are
and why you may want to disable them.

valueOf

Returns the enum constant of this type with the specified name.
The string must match exactly an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
not permitted.)